This paper aims to establish a relationship between surface roughness results from hydroabrasive processing and parameters with controlled variability, traverse speed and stand-off distance. Measuring the influence of these parameters is done using statistical and experimental tools. Establishing the relationship between the variation of input signals and the variation of result, is performed by introducing coefficients whose values determine the interdependence function between the input signal and response. Have been obtained diagrams of behavior of hydroabrasive process which allowed conclusions about the variability of the results obtained. Thus it can be concluded that the traverse speed and stand-off distance are input signals and they depends on the initial configuration of the system and its adjustment possibilities by variability of controlled parameters. Roughness is a result of this application, clearly defined which can be optimized by setting controlled parameters.

Abstract. Dimensional variability arises in AWJ system from uncontrolled factors intervention or due to the variability of input signals considered fixed or due to interactions of the input signals with unexpected effects, leading to deterioration of unpredictable outcome. Number of noise factors, negatively influence the results registered, dispersion of the result values is directly proportional to the number and their effect. Stochastic influence and his unpredictable nature determine a thorough research of the hydroabrasive process. The research refers to the study of dimensional variability for different configurations of hydroabrasive liquid pressure, abrasive type and traverse velocity. This is achieved by performing the experiments statistically processed by combining of control parameters, which allow favorable conclusions on reducing variability results and on optimizing the entire process of hydroabrasive machining.

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